BLACK HAWK DOWN, by Mark Bowden. (Penguin, $13.95.) The bloody battle between American forces and Somali street fighters in Mogadishu in 1993.
First Chapter

19

A WALK IN THE WOODS, by Bill Bryson. (Broadway, $13.) A journalist finds beauty and humor while hiking the Appalachian Trail.

20

RAISING CAIN, by Dan Kindlon and Michael Thompson with Teresa Barker. (Living Planet/ Ballantine, $14.) A study of the special needs of boys and how they can best be understood and fulfilled by families and teachers.

21

BLIND MAN'S BLUFF, by Sherry Sontag and Christopher Drew with Annette Lawrence Drew. (Harper Paperbacks, $7.99.) American espionage by submarine, from the cold
war to the present.
First Chapter

22

INTO THIN AIR, by Jon Krakauer. (Anchor, $13 and $7.99.) Ascending Mount Everest in 1996, the deadliest season in history.

23

UNDER THE TUSCAN SUN, by Frances Mayes. (Broadway, $13.) A celebration of life in the Italian countryside.

24

MY DOG SKIP, by Willie Morris. (Vintage Books, $10.) A memoir of the English smooth-haired fox terrier that was the author's boyhood friend.

Rankings reflect sales, for the week ending April 29, at almost 4,000 bookstores plus wholesalers serving 60,000 other retailers, statistically weighted to represent all such outlets. An asterisk (*) indicates that a book's
sales are barely distinguishable from those of the book above. A dagger (+)indicates that some stores received bulk orders. Expanded rankings are available at The New York Times on the Web: www.nytimes.com/books.